![background image](http://html.mh-extra.com/html/canon/d78-5311/d78-5311_service-manual_62454055.webp)
[B-signal center adjustment]
8. Connect the digital voltmeter to test point "TP25B1" (+) and chassis ground (-).
9. Select item no. "2" of group no. "3" and change data value to adjust it so that the
voltage value is 7.30 ± 0.05 V.
2.7 Black Level Adjustment
1. Receive the 16-step gray scale computer signal.
2. Set to
COMPUTER
mode.
3. Enter the service mode.
[R-black level adjustment]
4. Connect an oscilloscope to test point "TP25R1" (+) and chassis ground (-).
5. Select item no. "3" of group no. "3" and change data value to adjust it so that
waveform "a" is 10.0 ± 0.1 V.
[G-black level adjustment]
6. Connect an oscilloscope to test point "TP25G1" (+) and chassis ground (-).
7. Select item no. "4" of group no. "3" and change data value to adjust it so that
waveform "a" is 10.0 ± 0.1 V.
[B-black level adjustment]
8. Connect an oscilloscope to test point "TP25B1" (+) and chassis ground (-).
9. Select item no. "5" of group no. "3" and change data value to adjust it so that
waveform "a" is 10.0 ± 0.1 V.
2.8 PC Offset Adjustment
1. Receive the 16-step gray scale computer signal.
2. Set to
COMPUTER
mode.
3. Enter the service mode.
[R offset adjustment]
4. Connect an oscilloscope to test point "TP25R1" (+) and chassis ground (-).
5. Select item no. "11" of group no. "3" and change data value to adjust it so that
waveform "a" (black signal part) has the maximum amplitude.
Part 3: Adjustment
3-12
(a)
black level
black level
Fig. 3-4
Содержание D78-5311
Страница 9: ...Part 1 General Information ...
Страница 22: ...Part 2 Repair Information ...
Страница 43: ...Part 3 Adjustment ...
Страница 65: ...Part 4 Troubleshooting ...
Страница 82: ...Part 4 Troubleshooting 4 17 BA7078AF Selector IC6241 CXA2101AQ RGB Matrix IC4101 ...
Страница 83: ...Part 4 Troubleshooting 4 18 CXD2064Q Digital Comb Filter IC2101 L3E01031 Level Shift IC3501 IC3531 IC3561 ...
Страница 85: ...Part 4 Troubleshooting 4 20 ML60851 USB I F IC9801 M62393 D A IC2571 ...
Страница 86: ...Part 4 Troubleshooting 4 21 TB1274AF Video Decoder IC1101 TA1318N AFC Detector IC6171 ...
Страница 87: ...Part 4 Troubleshooting 4 22 FA7612CA PWC Controller IC65A IC671 IC681 STR Z2156 Switching Controller IC631 ...
Страница 88: ...Part 5 Parts Catalog ...
Страница 89: ......
Страница 107: ...Part 6 Electrical Diagrams ...
Страница 117: ......